This article provides comprehensive consideration of the age-dependent morphofunctional state of organs and tissues of the immune system (thymus, spleen, superficial and deep lymph nodes) in cattle. The morphofunctional maturity of organs and tissues of the immune system in cattle will be taken into account in various experimental studies, preventive and therapeutic measures. Performed analysis provides description of the spleen formation as well as the thymus and lymph nodes in post-natal ontogenesis and the macro- and microscopic structure of lymphoid cells and macrophages. The obtained results can be used to study immune responses of the thymus, spleen, lymph nodes in the pathological immunogenesis and may serve as a basis for development of recommendations related to diagnosis and treatment of diseases of the cattle immune system. The morphofunctional state of organs and tissues of the immune system in cattle was first studied with regard to the age dynamics. Based on the immunohistological studies, this article described the distribution and topography of immunocompetent cells (T lymphocytes, B lymphocytes and macrophages) and proliferative activity of lymphoid cells in the lymphoid organs and tissues in cattle.
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